CN110756158A - Composite drying agent and preparation method and application thereof - Google Patents
Composite drying agent and preparation method and application thereof Download PDFInfo
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0281—Sulfates of compounds other than those provided for in B01J20/045
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/045—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing sulfur, e.g. sulfates, thiosulfates, gypsum
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
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- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
- B01D2253/1124—Metal oxides
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- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
- B01D2253/1128—Metal sulfides
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Abstract
The invention relates to a composite drying agent and a preparation method and application thereof. The composite drying agent comprises, by mass, 10-20% of calcium chloride, 10-20% of magnesium sulfate, 5-15% of copper sulfate and 45-65% of silica gel. Calcium chloride, magnesium sulfate, copper sulfate and silica gel interact to form a tiny adsorption unit. The contact area of the tiny adsorption units and the insulating gas is large, so that the composite drying agent has good drying effect and drying efficiency. Meanwhile, the adsorption unit is not easy to agglomerate after adsorbing moisture, so that the blockage of a circulation channel of insulating gas can be effectively prevented, and the drying efficiency is further improved. The preparation method of the composite drying agent is simple and easy to implement, does not need complex process steps and expensive equipment, and is suitable for industrial production. The composite drying agent is applied to the gas-insulated totally-enclosed distribution device, can effectively remove moisture in insulating gas, improves the performance of the insulating gas, and ensures the normal use of the gas-insulated totally-enclosed distribution device.
Description
Technical Field
The invention relates to the field of insulating gas drying, in particular to a composite drying agent and a preparation method and application thereof.
Background
In the power industry, Gas Insulated Switchgear (GIS) have the advantages of small footprint, high reliability, high safety, low maintenance effort, etc., and are commonly used for insulation and protection of medium and high voltage transmission and distribution infrastructures. In electrical distribution devices, the properties of the insulating gas have a significant impact on the normal use of the electrical distribution device. In order to ensure the normal use of the power distribution device, the insulating gas needs to be treated correspondingly, and the moisture in the insulating gas needs to be removed. The traditional common treatment method has poor effect of removing moisture in the insulating gas, and often has the problems of moisture residue after treatment or low water removal efficiency and the like.
Disclosure of Invention
Therefore, a composite drying agent with good drying effect and high efficiency, and a preparation method and application thereof are needed to be provided.
The composite drying agent comprises the following raw materials in percentage by mass:
10 to 20 percent of calcium chloride, 10 to 20 percent of magnesium sulfate, 5 to 15 percent of copper sulfate and 45 to 65 percent of silica gel.
In one embodiment, the composite drying agent comprises the following raw materials in percentage by mass:
10 to 18 percent of calcium chloride, 15 to 20 percent of magnesium sulfate, 5 to 13 percent of copper sulfate and 50 to 65 percent of silica gel.
In one embodiment, the composite drying agent comprises the following raw materials in percentage by mass:
12 to 15 percent of calcium chloride, 16 to 18 percent of magnesium sulfate, 7 to 12 percent of copper sulfate and 55 to 64 percent of silica gel.
In one embodiment, the silica gel is silica gel particles, and the particle size of the silica gel particles is 60-100 μm; and/or the presence of a gas in the gas,
the silica gel is porous silica gel, and the porosity of the porous silica gel is 80-90%.
A preparation method of the composite desiccant comprises the following steps:
dissolving calcium chloride, magnesium sulfate and copper sulfate in a solvent to obtain a mixed solution;
mixing the mixed solution with silica gel, and evaporating the solvent to dryness to obtain a composite desiccant preform;
drying the composite desiccant preform;
the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel are respectively as follows by mass percent: 10-20% of calcium chloride, 10-20% of magnesium sulfate, 5-15% of copper sulfate and 45-65% of silica gel.
In one embodiment, the solvent is water.
In one embodiment, the preparation method of the composite drying agent further comprises the step of stirring the mixed solution during the process of evaporating the solvent to dryness.
In one embodiment, drying the composite desiccant preform comprises the steps of:
placing the composite desiccant preform in a vacuum environment with the vacuum degree of 1-10 kPa for primary drying at 150-180 ℃, wherein the primary drying time is 2-4 h;
and crushing the composite drying agent preform after the primary drying, and performing secondary drying at 150-180 ℃ in a vacuum environment of 1-10 kPa for 1-2 h.
The composite desiccant in any embodiment of the above embodiments is applied as a desiccant in a gas insulated fully enclosed power distribution unit.
In one embodiment, the insulating gas to be treated is passed through the composite desiccant at a temperature of 10 ℃ to 60 ℃.
The composite drying agent comprises, by mass, 10-20% of calcium chloride, 10-20% of magnesium sulfate, 5-15% of copper sulfate and 45-65% of silica gel. The composite drying agent is prepared from calcium chloride, magnesium sulfate, copper sulfate and silica gel in proper mass percentage, and can fully exert the physical adsorption performance and the chemical adsorption performance of the composite drying agent. Specifically, calcium chloride, magnesium sulfate and copper sulfate are combined with water molecules to form hydrates so as to dry the insulating gas; silica gel adsorbs moisture through its large specific surface area to achieve drying of the insulating gas.
The composite desiccant takes silica gel as a framework material, the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel interact to form tiny adsorption units, and in the drying process, the contact area between the tiny adsorption units and insulating gas is large, so that the composite desiccant has good drying efficiency. Simultaneously, because there is the silica gel skeleton, can play good dispersion and stabilizing action to the adsorption unit, the adsorption unit is difficult for the caking after adsorbing moisture, can effectively prevent among the compound drier insulating gas's circulation passageway to block up, further improves drying efficiency.
The preparation method of the composite drying agent is simple and easy to implement, does not need complex process steps and expensive equipment, and is suitable for industrial production.
The composite drying agent is applied to the gas-insulated totally-enclosed distribution device, and in the using process of the gas-insulated totally-enclosed distribution device, the composite drying agent can effectively remove moisture in insulating gas, improve the performance of the insulating gas and ensure the normal use of the gas-insulated totally-enclosed distribution device.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the accompanying examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The "vacuum" in the present invention means an actual value of the system pressure. For example, a vacuum of 10kPa in the vacuum drying oven means that the actual value of the pressure in the vacuum drying oven is 10 kPa.
An embodiment of the present invention provides a composite desiccant, which is characterized in that: the material comprises the following raw materials in percentage by mass:
10 to 20 percent of calcium chloride, 10 to 20 percent of magnesium sulfate, 5 to 15 percent of copper sulfate and 45 to 65 percent of silica gel.
Preferably, the composite drying agent consists of the following raw materials in percentage by mass:
10 to 20 percent of calcium chloride, 10 to 20 percent of magnesium sulfate, 5 to 15 percent of copper sulfate and 45 to 65 percent of silica gel.
In a specific example, the composite desiccant comprises the following raw materials in percentage by mass:
10 to 18 percent of calcium chloride, 15 to 20 percent of magnesium sulfate, 5 to 13 percent of copper sulfate and 50 to 65 percent of silica gel.
Preferably, the composite drying agent consists of the following raw materials in percentage by mass:
10 to 18 percent of calcium chloride, 15 to 20 percent of magnesium sulfate, 5 to 13 percent of copper sulfate and 50 to 65 percent of silica gel.
In a specific example, the composite desiccant comprises the following raw materials in percentage by mass:
12 to 15 percent of calcium chloride, 16 to 18 percent of magnesium sulfate, 7 to 12 percent of copper sulfate and 55 to 64 percent of silica gel.
Preferably, the composite drying agent consists of the following raw materials in percentage by mass:
12 to 15 percent of calcium chloride, 16 to 18 percent of magnesium sulfate, 7 to 12 percent of copper sulfate and 55 to 64 percent of silica gel.
For insulating gas, improper selection of chemical desiccant easily causes the desiccant to react with the insulating gas, and the performance of the insulating gas is affected. In addition, since the chemical desiccant has a small specific surface area and a small contact area with the insulating gas during drying, the drying effect is not satisfactory. Meanwhile, the chemical drying agent is easy to agglomerate after absorbing moisture, so that the drying capacity of the drying agent can be greatly weakened, a circulation channel of insulating gas can be blocked, and the drying effect is reduced. The physical desiccant is used for nonspecific physical adsorption in the drying process, and although the physical desiccant has a large specific surface area and can sufficiently contact with the insulating gas to have a good adsorption effect on moisture in the insulating gas, since the adsorption process is nonspecific, the physical desiccant also adsorbs the insulating gas to cause a loss of the insulating gas.
The composite drying agent in the embodiment can fully exert physical adsorption performance and chemical adsorption performance. According to the drying principle, chemical drying agents such as calcium chloride, magnesium sulfate and copper sulfate are combined with water molecules to form hydrates so as to dry the insulating gas, and the calcium chloride, the magnesium sulfate and the copper sulfate cannot react with the insulating gas and cannot influence the performance of the insulating gas; silica gel (physical desiccant) adsorbs moisture by its large specific surface area to dry the insulating gas. In the embodiment, the composite desiccant takes silica gel as a framework material, the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel interact to form tiny adsorption units, and in the drying process, the contact area between the tiny adsorption units and the insulating gas is large, so that the composite desiccant has good drying efficiency of a drying effect, meanwhile, the non-specific adsorption of the silica gel on the insulating gas can be effectively inhibited, and the loss of the insulating gas is reduced. Simultaneously, because there is the silica gel skeleton, can play good dispersion and stabilizing action to the adsorption unit for adsorption unit is difficult for the caking after adsorbing moisture, can effectively prevent insulating gas's circulation passageway from blockking up, further improves drying efficiency.
In a specific example, the silica gel is silica gel particles, and the particle size of the silica gel particles is 60 μm to 100 μm. Silica gel can be used as a framework of the drying agent in the composite drying agent, the support effect of the framework cannot be fully exerted if the particle size of silica gel particles is too small, and the silica gel particles are not beneficial to uniform dispersion of calcium chloride, magnesium sulfate and copper sulfate, so that the uniformity of a tiny adsorption unit formed by interaction of the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel is reduced, and the adsorption of moisture in insulating gas is not facilitated. If the particle size of the silica gel particles is too large, the volume of the composite desiccant is correspondingly increased, and the filling density of the composite desiccant is reduced in the use process of the composite desiccant, so that the drying effect is reduced.
In a specific example, the silica gel is a porous silica gel having a porosity of 80% to 90%. The porous silica gel in the composite desiccant can be used as a framework of the desiccant, so that the interior of the composite desiccant is of a porous structure. In the use process of the composite drying agent, the porous structure is beneficial to increasing the contact area of the insulating gas and the drying agent, and can improve the drying effect and the removal rate of the drying agent to the moisture in the insulating gas. Meanwhile, due to the existence of the silica gel framework, the composite drying agent is not easy to agglomerate after absorbing moisture, the channel of the insulating gas can be effectively prevented from being blocked, and the drying efficiency is further improved.
An embodiment of the present invention further provides a method for preparing a composite desiccant, including the following steps:
dissolving calcium chloride, magnesium sulfate and copper sulfate in a solvent to obtain a mixed solution;
mixing the mixed solution with silica gel, and evaporating the solvent to dryness to obtain a composite desiccant preform;
and drying the composite drying agent preform.
The mass percentages of the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel are respectively as follows: 10-20% of calcium chloride, 10-20% of magnesium sulfate, 5-15% of copper sulfate and 45-65% of silica gel.
In the preparation process of the composite desiccant, calcium chloride, magnesium sulfate and copper sulfate are dissolved in a solvent, then the mixture is mixed with silica gel, the solvent is evaporated to dryness to obtain a composite desiccant preform, and then the composite desiccant preform is dried to obtain the composite desiccant in the embodiment. The preparation method is simple and easy to implement, does not need complex process steps and expensive equipment, and is suitable for industrial production.
In one particular example, the solvent is water. The calcium chloride, the magnesium sulfate and the copper sulfate have good solubility in water by taking water as a solvent, are convenient to dissolve quickly and can form a uniform mixed solution. Preferably, during the dissolution process, stirring and/or heating may be performed during the dissolution process in order to accelerate the dissolution rate.
In a specific example, the preparation method of the composite drying agent further comprises the step of stirring the mixed solution during the process of evaporating the solvent to dryness. The solvent is evaporated to dryness after the mixed solution is mixed with the silica gel, and the mixed solution and the silica gel can be more fully mixed by stirring in the process of evaporating the solvent to dryness, so that the composite drying agent is more uniform in structure.
Preferably, the solvent is evaporated to dryness by heating, and the mixed solution is stirred during the heating process, so as to improve the uniformity of mixing the mixed solution with the silica gel and simultaneously improve the evaporation speed of the solvent. It will be appreciated that the heating temperature and stirring conditions may be selected as appropriate depending on the nature of the solvent used during the evaporation of the solvent to dryness.
In one particular example, drying the composite desiccant preform includes the steps of:
placing the composite desiccant preform in a vacuum environment with the vacuum degree of 1-10 kPa for primary drying at 150-180 ℃, wherein the primary drying time is 2-4 h;
and crushing the composite drying agent pre-formed product after primary drying, and performing secondary drying at 150-180 ℃ in a vacuum environment of 1-10 kPa for 1-2 h.
In the drying process of the composite desiccant preform, the calcium chloride, the magnesium sulfate and the copper sulfate are crystallized, separated and dispersed on the silica gel framework and act with the silica gel to form a tiny adsorption unit, and when the insulating gas passes through the adsorption unit, the adsorption unit and the insulating gas have a large contact area, so that the removal efficiency of moisture in the insulating gas is high. Meanwhile, due to the existence of the silica gel framework, the adsorption unit is not easy to agglomerate after adsorbing the moisture in the insulating gas, so that the blockage of a circulation channel of the insulating gas is avoided, and the drying effect and the drying efficiency of the composite drying agent on the moisture in the insulating gas are further improved.
In the first drying process, the composite drying agent pre-finished product is dried at the temperature of 150-180 ℃ and under the condition of 1 kPa-10 kPa, and the calcium chloride, the magnesium sulfate and the copper sulfate are crystallized, separated and dispersed on a silica gel framework and interact with the silica gel to form a tiny adsorption unit. Preferably, in the first drying process, the composite desiccant preform is flatly laid in the drying equipment, and the thickness of the flatly laid composite desiccant preform is 0.3 cm-1 cm, so that the drying effect of the first drying is improved. Preferably, the thickness of the composite desiccant preform after being laid flat is 0.4cm to 0.8 cm. In this example, the thickness of the composite desiccant preform after being laid flat at the time of first drying was 0.5 cm. After the primary drying, the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel have sufficient effect, and the composite desiccant preform has large particle size and irregular shape. In order to facilitate storage and filling of the composite desiccant, the composite desiccant preform after the first drying is pulverized into a desired particle size, and the pulverization method may be a pulverization method commonly used in the industry, such as ball milling. And (3) drying the crushed composite desiccant preform for the second time at the temperature of 150-180 ℃ and under the condition of 1-10 kPa for 1-2 h to obtain the composite desiccant, and filling the composite desiccant into a drying column for use or sealing storage.
The embodiment of the invention also provides application of the composite desiccant in a gas-insulated fully-closed distribution device as a desiccant. The composite drying agent is applied to the gas-insulated totally-enclosed power distribution device, and in the using process of the gas-insulated totally-enclosed power distribution device, the composite drying agent can effectively remove moisture in insulating gas, improve the performance of the insulating gas and ensure the normal use of the gas-insulated totally-enclosed power distribution device.
In one specific example, the insulating gas to be treated is passed through the composite desiccant at 10 ℃ to 60 ℃. The drying effect and drying efficiency of the drying agent have a close relationship with the drying temperature. The drying temperature is too low, the activity of the drying agent is low, and the drying effect on the insulating gas is poor; the drying temperature is too high, more energy is consumed, and the normal use of the insulating gas is not facilitated. Preferably, the insulating gas to be treated is passed through the composite desiccant at 20 ℃ to 40 ℃. Further preferably, the insulating gas to be treated passes through the composite desiccant at 25-30 ℃, so that the drying effect of the composite desiccant on the insulating gas can be further improved. It will be appreciated that, in actual use, a suitable drying temperature may be set in accordance with the actual use temperature of the insulating gas.
The following are specific examples:
example 1
(1) 150g of calcium chloride, 200g of magnesium sulfate and 100g of copper sulfate were dissolved in 2000mL of distilled water to obtain a mixed solution.
(2) 800g of silica gel (the porosity of the silica gel is 87%) with the particle size of 75 μm is added into the mixed solution, and the distilled water in the mixed solution is evaporated by heating under the stirring condition to obtain the composite desiccant preform.
(3) And (3) flatly spreading the composite desiccant preform obtained in the step (2) in a vacuum drying box, wherein the thickness of the flatly spread composite desiccant preform is 0.5 cm. Setting the vacuum degree of the vacuum drying oven to 10kPa, setting the drying temperature to 160 ℃, and carrying out primary drying for 3 h.
(4) And (4) crushing the composite drying agent preform subjected to the primary drying in the step (3), and performing secondary drying in a vacuum drying oven at the temperature of 160 ℃ under the condition of 10kPa, wherein the time for the secondary drying is 2 h. And obtaining the composite drying agent after secondary drying.
Example 2
(1) 250g of calcium chloride, 150g of magnesium sulfate and 120g of copper sulfate were dissolved in 2000mL of distilled water to obtain a mixed solution.
(2) Adding 800g of silica gel (the porosity of the silica gel is 87%) with the particle size of 87 mu m into the mixed solution, and evaporating distilled water in the mixed solution by heating under the stirring condition to obtain the composite desiccant preform.
(3) And (3) flatly spreading the composite desiccant preform obtained in the step (2) in a vacuum drying box, wherein the thickness of the flatly spread composite desiccant preform is 0.5 cm. Setting the vacuum degree of the vacuum drying oven to 10kPa, setting the drying temperature to 160 ℃, and carrying out primary drying for 3 h.
(4) And (4) crushing the composite drying agent preform subjected to the primary drying in the step (3), and performing secondary drying in a vacuum drying oven at the temperature of 160 ℃ under the condition of 10kPa, wherein the time for the secondary drying is 2 h. And obtaining the composite drying agent after secondary drying.
Example 3
Testing the drying effect of the composite drying agent: 500g of the composite desiccant obtained in example 1 was charged in a drying column having a diameter of 3cm, and an insulating gas (the main component was C)4F7N/CO2) Passing through a drying column, measuring the water content in the insulating gas before and after drying by using a GS-GASPRO gas chromatographic column, wherein the gas flow rate is 2000mL/min, the column temperature is 26 ℃. The moisture content of the insulating gas before drying was 147ppm, and no moisture was detected in the insulating gas after drying. The composite desiccant in example 1 is described as having a good effect of removing moisture in the insulating gas, and being capable of deeply dehydrating the insulating gas.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A composite desiccant is characterized in that: the material comprises the following raw materials in percentage by mass:
10 to 20 percent of calcium chloride, 10 to 20 percent of magnesium sulfate, 5 to 15 percent of copper sulfate and 45 to 65 percent of silica gel.
2. The composite desiccant of claim 1, wherein: the material comprises the following raw materials in percentage by mass:
10 to 18 percent of calcium chloride, 15 to 20 percent of magnesium sulfate, 5 to 13 percent of copper sulfate and 50 to 65 percent of silica gel.
3. The composite desiccant of claim 1, wherein: the material comprises the following raw materials in percentage by mass:
12 to 15 percent of calcium chloride, 16 to 18 percent of magnesium sulfate, 7 to 12 percent of copper sulfate and 55 to 64 percent of silica gel.
4. The composite desiccant of any one of claims 1-3, wherein: the silica gel is silica gel particles, and the particle size of the silica gel particles is 60-100 mu m; and/or the presence of a gas in the gas,
the silica gel is porous silica gel, and the porosity of the porous silica gel is 80-90%.
5. The preparation method of the composite drying agent is characterized by comprising the following steps: the method comprises the following steps:
dissolving calcium chloride, magnesium sulfate and copper sulfate in a solvent to obtain a mixed solution;
mixing the mixed solution with silica gel, and evaporating the solvent to dryness to obtain a composite desiccant preform;
drying the composite desiccant preform;
the calcium chloride, the magnesium sulfate, the copper sulfate and the silica gel are respectively as follows by mass percent: 10-20% of calcium chloride, 10-20% of magnesium sulfate, 5-15% of copper sulfate and 45-65% of silica gel.
6. The method of preparing a composite desiccant according to claim 5 wherein: the solvent is water.
7. The method of preparing a composite desiccant according to any one of claims 5 to 6, wherein: further comprising the step of stirring the mixed solution during the process of evaporating the solvent to dryness.
8. The method of preparing a composite desiccant according to any one of claims 5 to 6, wherein: drying the composite desiccant preform comprises the following steps:
placing the composite desiccant preform in a vacuum environment with the vacuum degree of 1-10 kPa for primary drying at 150-180 ℃, wherein the primary drying time is 2-4 h;
and crushing the composite drying agent preform after the primary drying, and performing secondary drying at 150-180 ℃ in a vacuum environment of 1-10 kPa for 1-2 h.
9. Use of a composite desiccant according to any one of claims 1 to 3 as a desiccant in a gas insulated fully enclosed electrical distribution apparatus.
10. The use of claim 9, wherein: and passing the insulating gas to be treated through the composite drying agent at the temperature of 10-60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910944331.3A CN110756158B (en) | 2019-09-30 | 2019-09-30 | Composite drying agent and preparation method and application thereof |
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| CN1843615A (en) * | 2006-03-08 | 2006-10-11 | 桂林工学院 | Method for preparing desiccant by natural parastilbite |
| CN101884905A (en) * | 2009-05-13 | 2010-11-17 | 中国石油化工股份有限公司 | Solid adsorbent and preparation method thereof |
| CN102294221A (en) * | 2011-06-28 | 2011-12-28 | 淮阴工学院 | Preparation method of attapulgite-based adsorption drying agent suitable for high humidity environment |
| CN102814166A (en) * | 2011-06-08 | 2012-12-12 | 工信华鑫科技有限公司 | Preparation method of copper ion special-purposed adsorption material |
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| CN1075664A (en) * | 1992-02-23 | 1993-09-01 | 谭勇军 | Moisture excluding and odor absorbing agent |
| WO2003018175A1 (en) * | 2001-08-22 | 2003-03-06 | Grace Gmbh & Co. Kg | Desiccant based on clay-bound zeolite, process for its preparation and its use |
| CN1843615A (en) * | 2006-03-08 | 2006-10-11 | 桂林工学院 | Method for preparing desiccant by natural parastilbite |
| CN101884905A (en) * | 2009-05-13 | 2010-11-17 | 中国石油化工股份有限公司 | Solid adsorbent and preparation method thereof |
| CN102814166A (en) * | 2011-06-08 | 2012-12-12 | 工信华鑫科技有限公司 | Preparation method of copper ion special-purposed adsorption material |
| CN102294221A (en) * | 2011-06-28 | 2011-12-28 | 淮阴工学院 | Preparation method of attapulgite-based adsorption drying agent suitable for high humidity environment |
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